Imperial College London

ProfessorGeoffreyHall

Faculty of Natural SciencesDepartment of Physics

Professor of Physics
 
 
 
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Contact

 

+44 (0)20 7594 7800g.hall Website

 
 
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Assistant

 

Ms Paula Brown +44 (0)20 7594 7823

 
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Location

 

511ABlackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Aad:2020:10.1007/JHEP08(2020)051,
author = {Aad, G and Abbott, B and Abbott, DC and Abud, AA and Abeling, K and Abhayasinghe, DK and Abidi, SH and AbouZeid, OS and Abraham, NL and Abramowicz, H and Abreu, H and Abulaiti, Y and Acharya, BS and Achkar, B and Adam, L and Bourdarios, CA and Adamczyk, L and Adamek, L and Adelman, J and Adersberger, M and Adiguzel, A and Adorni, S and Adye, T and Affolder, AA and Afik, Y and Agapopoulou, C and Agaras, MN and Aggarwal, A and Agheorghiesei, C and Aguilar-Saavedra, JA and Ahmad, A and Ahmadov, F and Ahmed, WS and Ai, X and Aielli, G and Akatsuka, S and Akesson, TPA and Akilli, E and Akimov, A and Al, Khoury K and Alberghi, GL and Albert, J and Verzini, MJA and Alderweireldt, S and Aleksa, M and Aleksandrov, IN and Alexa, C and Alexopoulos, T and Alfonsi, A and Alfonsi, F and Alhroob, M and Ali, B and Ali, S and Aliev, M and Alimonti, G and Allaire, C and Allbrooke, BMM and Allen, BW and Allport, PP and Aloisio, A and Alonso, F and Alpigiani, C and Alshehri, AA and Camelia, EA and Alvarez},
doi = {10.1007/JHEP08(2020)051},
journal = {The Journal of High Energy Physics},
pages = {1--67},
title = {Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at root s=8 TeV},
url = {http://dx.doi.org/10.1007/JHEP08(2020)051},
volume = {2020},
year = {2020}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of about 20 fb−1 for each experiment. The measurements used events containing one lepton and having different jet multiplicities in the final state. The results are quoted as fractions of W bosons with longitudinal (F0), left-handed (FL), or right-handed (FR) polarizations. The resulting combined measurements of the polarization fractions are F0 = 0.693 ± 0.014 and FL = 0.315 ± 0.011. The fraction FR is calculated from the unitarity constraint to be FR = −0.008 ± 0.007. These results are in agreement with the standard model predictions at next-to-next-to-leading order in perturbative quantum chromodynamics and represent an improvement in precision of 25 (29)% for F0 (FL) with respect to the most precise single measurement. A limit on anomalous right-handed vector (VR), and left- and right-handed tensor (gL, gR) tWb couplings is set while fixing all others to their standard model values. The allowed regions are [−0.11, 0.16] for VR, [−0.08, 0.05] for gL, and [−0.04, 0.02] for gR, at 95% confidence level. Limits on the corresponding Wilson coefficients are also derived.
AU - Aad,G
AU - Abbott,B
AU - Abbott,DC
AU - Abud,AA
AU - Abeling,K
AU - Abhayasinghe,DK
AU - Abidi,SH
AU - AbouZeid,OS
AU - Abraham,NL
AU - Abramowicz,H
AU - Abreu,H
AU - Abulaiti,Y
AU - Acharya,BS
AU - Achkar,B
AU - Adam,L
AU - Bourdarios,CA
AU - Adamczyk,L
AU - Adamek,L
AU - Adelman,J
AU - Adersberger,M
AU - Adiguzel,A
AU - Adorni,S
AU - Adye,T
AU - Affolder,AA
AU - Afik,Y
AU - Agapopoulou,C
AU - Agaras,MN
AU - Aggarwal,A
AU - Agheorghiesei,C
AU - Aguilar-Saavedra,JA
AU - Ahmad,A
AU - Ahmadov,F
AU - Ahmed,WS
AU - Ai,X
AU - Aielli,G
AU - Akatsuka,S
AU - Akesson,TPA
AU - Akilli,E
AU - Akimov,A
AU - Al,Khoury K
AU - Alberghi,GL
AU - Albert,J
AU - Verzini,MJA
AU - Alderweireldt,S
AU - Aleksa,M
AU - Aleksandrov,IN
AU - Alexa,C
AU - Alexopoulos,T
AU - Alfonsi,A
AU - Alfonsi,F
AU - Alhroob,M
AU - Ali,B
AU - Ali,S
AU - Aliev,M
AU - Alimonti,G
AU - Allaire,C
AU - Allbrooke,BMM
AU - Allen,BW
AU - Allport,PP
AU - Aloisio,A
AU - Alonso,F
AU - Alpigiani,C
AU - Alshehri,AA
AU - Camelia,EA
AU - Alvarez,Estevez M
AU - Alviggi,MG
AU - Amaral,Coutinho Y
AU - Ambler,A
AU - Ambroz,L
AU - Amelung,C
AU - Amidei,D
AU - Amor,Dos Santos SP
AU - Amoroso,S
AU - Amrouche,CS
AU - An,F
AU - Anastopoulos,C
AU - Andari,N
AU - Andeen,T
AU - Anders,CF
AU - Anders,JK
AU - Andrean,SY
AU - Andreazza,A
AU - Andrei,V
AU - Anelli,CR
AU - Angelidakis,S
AU - Angerami,A
AU - Anisenkov,A
AU - Annovi,A
AU - Antel,C
AU - Anthony,MT
AU - Antipov,E
AU - Antonelli,M
AU - Antrim,DJA
AU - Anulli,F
AU - Aoki,M
AU - Aparisi,Pozo JA
AU - Aparo,MA
AU - Aperio,Bella L
AU - Araujo,Ferraz V
AU - Araujo,Pereira R
AU - Arcangeletti,C
AU - Arce,ATH
AU - Arduh,FA
AU - Arguin,J-F
AU - Argyropoulos,S
AU - Arling,J-H
AU - Armbruster,AJ
AU - Armstrong,A
AU - Arnaez,O
AU - Arnold,H
AU - Tame,ZPA
AU - Artoni,G
AU - Artz,S
AU - Asai,S
AU - Asawatavonvanich,T
AU - Asbah,N
AU - Asimakopoulou,EM
AU - Asquith,L
AU - Assahsah,J
AU - Assamagan,K
AU - Astalos,R
AU - Atkin,RJ
AU - Atkinson,M
AU - Atlay,NB
AU - Atmani,H
AU - Augsten,K
AU - Avolio,G
AU - Ayoub,MK
AU - Azuelos,G
AU - Bachacou,H
AU - Bachas,K
AU - Backes,M
AU - Backman,F
AU - Bagnaia,P
AU - Bahmani,M
AU - Bahrasemani,H
AU - Bailey,AJ
AU - Bailey,VR
AU - Baines,JT
AU - Bakalis,C
AU - Baker,OK
AU - Bakker,PJ
AU - Gupta,DB
AU - Balaji,S
AU - Baldin,EM
AU - Balek,P
AU - Balli,F
AU - Balunas,WK
AU - Balz,J
AU - Banas,E
AU - Bandieramonte,M
AU - Bandyopadhyay,A
AU - Banerjee,S
AU - Barak,L
AU - Barbe,WM
AU - Barberio,EL
AU - Barberis,D
AU - Barbero,M
AU - Barbour,G
AU - Barillari,T
AU - Barisits,M-S
AU - Barkeloo,J
AU - Barklow,T
AU - Barnea,R
AU - Barnett,BM
AU - Barnett,RM
AU - Barnovska-Blenessy,Z
AU - Baroncelli,A
AU - Barone,G
AU - Barr,AJ
AU - Bar
DO - 10.1007/JHEP08(2020)051
EP - 67
PY - 2020///
SN - 1029-8479
SP - 1
TI - Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at root s=8 TeV
T2 - The Journal of High Energy Physics
UR - http://dx.doi.org/10.1007/JHEP08(2020)051
UR - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000562898300001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR - https://link.springer.com/article/10.1007%2FJHEP08%282020%29051
UR - http://hdl.handle.net/10044/1/82897
VL - 2020
ER -